A simple wideband digital predistortion system based on improved Powell algorithm

Zitong Lan; Qi Zhang; Xiangjun Xin; Qinghua Tian; Ying Tao; Yufei Shen; Guixing Cao; Naijing Liu; Jixi Qian

doi:10.1117/12.2506220

15 November 2018 A simple wideband digital predistortion system based on improved Powell algorithm

Zitong Lan, Qi Zhang, Xiangjun Xin, Qinghua Tian, Ying Tao, Yufei Shen, Guixing Cao, Naijing Liu, Jixi Qian

Proceedings Volume 10964, Tenth International Conference on Information Optics and Photonics; 109644W (2018) https://doi.org/10.1117/12.2506220
Event: Tenth International Conference on Information Optics and Photonics (CIOP 2018), 2018, Beijing, China

Abstract

In order to solve the analog-to-digital converter (ADC) sampling rate in the traditional digital predistortion (DPD) system must be several times the bandwidth of the original signal to cover the out-of-band intermodulation components caused by nonlinear radio frequency power amplifiers (PA), lowcost ADC cannot meet today's demand problems. This paper proposes a robust iterative DPD coefficient extraction algorithm based on Powell algorithm and random demodulation. This method applies an improved Powell algorithm to a DPD parameter extraction system. The simulation studies the linearization performance of the system. The results show that when the system feedback bandwidth is equal to the original signal bandwidth, satisfactory linearization performance can be obtained. In addition, different from LM algorithm, Powell algorithm does not require partial derivatives of the estimated parameters, the system is simplified.

Citation Download Citation

Zitong Lan, Qi Zhang, Xiangjun Xin, Qinghua Tian, Ying Tao, Yufei Shen, Guixing Cao, Naijing Liu, and Jixi Qian "A simple wideband digital predistortion system based on improved Powell algorithm", Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 109644W (15 November 2018); https://doi.org/10.1117/12.2506220

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